Smoothing device for impression blankets



Sept. 3, 1929. o. c. RoEsEN SMOOTHING DEVICE FOR IMPRESSION BLANKETSoriginal Filed June 7, 192e @MIC uwwn

MN. 1 t

Patented Sept. 3, 1929.

UNITED STATES Emi'l'ENT OFFECE.

OSCAR CHARLES ROE-SEN, 0F BROOKLYN, NEW YORK, ASSIGNOR TO VOOD NEVVS-PAPER `MA(3l-'EINRY CORPORATION, OF NEVE YGRK, N. Y., A CORORATION 0FVIRGINIA.

SMOOTHING DEVICE FOR MPRLISSION BLANKETS.

Application filed June 7, 1926, Serial No. 114,227. Renewed February 12,1929.

This invention relates to means for working outor eliminating thedepressions and projections that the blanket on the impression cylinderof a rotary printing press retains after a plurality of printingimpressions.

The principal objects of the invention are to provide means by which theblanket is reduced more nearly to a uniform surface after repeatedimpressions and to provide said means in a form in which it willcontinually smooth out the blanket as the press operates, thus making itimpossible for any particular impression or repeated number ofimpressions to cause the surface of the blanket to have deep depressionsor high reliefs at any time.

Reference is to be had to the accompanying drawing in which the figureis a diagrammatic side view of the two couples of a perfecting web pressshowing a preferred form of this invention applied to each impressioncylinder.

It is a well known fact that after an edition of a newspaper has beencomplete the surfaces of the blankets around the impression cylindersare impressed with the design on their respective plate cylinders withwhich they came in contact during printing. During the printing of thenext edition the design on the plate cylinders may be of an entirelydifferent nature. The points of greatest depression on the blanket arelikely to be in different regions from the points of greatest depressionproduced by the new plates. Poor printing is the result at the beginningof an edition and a number of imprints have to be thrown out. Thisgradually works out as the impressions are repeated, but that is likelyto be a long process.

This invention is designed to overcome these difficulties and eliminatethe loss of a considerable amount of paper at the beginning of eachedit-ion.

For this purpose I provide along each impression cylinder 10 an ironingdevice in the form of a roller 11. This roller extends across the entirewidth of the cylinder. It is pressed by springs 12, located along astationary part of the frame 13, against the surface of the impressioncylinder. These springs 12 are located at both ends of the ironingroller 11 or at intervals along the length thereof. Each roller 11 ismounted on a pivoted frame 14 so that the springs will be readilyeffective for the purpose intended. The rollers are free on their studsor shafts and will rotate on their axes by the action of the impressioncylinder itself. Thus they will continually smooth out the impressionwhich may be left on the blanket 15 on the impression cylinder.

In this way no impression can be made very deeply and the surface of theblanket is kept practically uniform all the time. Therefore when theplates 16 on the plate cylinder 17 are changed they do not have to actagainst a blanket that has previously been provided with deepdepressions. They practically always work against what is equivalent tothe surface of a new blanket except that this blanket may be compressedby the spring pressed rollers.

This eliminates the above mentioned difficulties and in fact makes theimpression better even on the first edition because the blankets do notbecome depressed at the points of heaviest printing as has been the caseheretofore.

Although I have illustrated and described only a single form of theinvention I am aware of the fact that modifications can be made by anyperson skilled in the art without departing from the scope of theinvention as expressed in the claims. Therefore I do not wish to belimited to the details shown, but what I claim is 1. In a printingpress, the combination with an impression cylinder having a blanket, ofmovably mounted automatically adjusted means for continually ironing outthe surface of the blanket as the press operates, for the purposedescribed.

2. In a printing press, the combination with an impression cylinder andits blanket, of a roller extending throughout the length of theimpression cylinder for rolling out the irregularities of the blanket;said roller being automatically adjusted to the irregularities in theblanket.

3. In a printing press, the combination with an impression cylinder, ofa roller extending parallel with the impression cylinder and extendingfrom end to end thereof and springs for pressing said roller against thecylinder to roll out irregularities all the Way across the impressioncylinder blanket. y

4. In a printing press, the combination With an impression cylinder,having a blanket thereon, of a freely rotatable roller arranged to berotated by surface Contact With the impression cylinder and movablymounted to move freely toward and from it,

and springs for constantly pressing said roller against the blanket toiron out the' blanket throughout the printing operation.

5. In a printing press, the combination With an impression cylinderhaving a blanket thereon, of movably mounted automatically adjustedmeans continuously in Contact with the impression cylinder for reducingthe irregularities in the surface of the blanket between impressions.

In testimony whereof I have hereunto affixed my signature.

y OSCAR CHARLES ROESEN.

